I selected the above print, and used Photoshop to add in something new, the aircraft carrier USS George H.W. Bush. The assignment offered “extra Internet points” for animating it, so I did that as well.
To animate an object in photoshop, I enabled the timeline. I pasted in the carrier on a new layer, after cutting it out with a selection made using the pen tool. I pasted it on to the post card. On the post card, I also cut out some of the foreground scenery and pasted it onto the topmost layer, allowing the aircraft carrier to sail in the background.
Using the timeline, I created new frames, and moved the carrier a bit to the left on each frame. My gif uses ten frames of animation. Once it was all completed, I saved using the export for web feature, saving it as an animated gif.